Method for producing electric contact and electrical connector

Abstract

A method for producing an electric contact extending from a copper foil, comprises steps of fixing a cover lay having a hole of a diameter smaller than that of the copper foil of a predetermined size to the copper foil, and plating the hole of the cover lay so as to reach the upper surface of the cover lay as a first step; installing a dry film having a hole of a diameter smaller than that of the hole of the cover lay onto the cover lay, and plating the hole of the dry film so as to reach the upper surface of the dry film as a second step; and after removal of the dry film, as a third step further plating the plate layers obtained in the first and second steps. The electric contacts produced by the method have a predetermined height which is as high as possible and uniform without causing any defective connection between them. In a method for producing an electrical connector, diameters of the holes of the dry film in plating are changed depending upon positions of the electric contacts.

1 . A method for producing an electric contact extending from a copper foil, comprising steps of: 
 fixing a cover lay having a hole of a diameter smaller than that of said copper foil of a predetermined size to said copper foil, and plating said hole of the cover lay so as to reach the upper surface of the cover lay as a first step; installing a dry film having a hole of a diameter smaller than that of said hole of the cover lay onto said cover lay, and plating said hole of the dry film so as to reach the upper surface of the dry film as a second step; and after removal of said dry film, as a third step further plating the plate layers obtained in the first and second steps.    
   
   
       2 . The method for producing an electric contact as set forth in  claim 1 , wherein the height of the produced electric contact is greater than the radius (one half of diameter) of the electric contact.  
   
   
       3 . A method for producing an electrical connector including a plurality of said electric contacts arranged with predetermined pitches, wherein diameters of the holes of the dry film used in plating are changed depending upon positions of the electric contacts.  
   
   
       4 . The method for producing an electrical connector as set forth in  claim 3 , wherein a plurality of said electric contacts are arranged with predetermined pitches in a substantially square area, and wherein diameters of said holes of the dry film in the proximity of four corners of the square area are smaller than diameters of those in the proximity of four sides of the square area, and diameters of those in the inner side of the area other than those in the proximities of the four corners and the four sides are larger than the diameters of those in the proximity of the four sides of the square area.